SECTION 652 – SANITARY SEWERS
652.01 Description
This Section describes the requirements for installing sanitary sewer gravity and force mains, sewer lining, sanitary sewer manholes, sanitary sewer connections, miscellaneous fittings, and testing.
652.02 Materials
Provide materials as specified: Coarse Aggregate (No. 57) ................................ ................................ ................................ ............................ 901.03 Soil Aggregate (I-3) ................................ ................................ ................................ ................................ ...... 901.11 Concrete ................................ ................................ ................................ ................................ ...................... 903.03 Mortar................................ ................................ ................................ ................................ ...................... 903.08.01 CLSM ................................ ................................ ................................ ................................ .......................... 903.09 Curing Materials ................................ ................................ ................................ ................................ .......... 903.10 Precast Manhole ................................ ................................ ................................ ................................ ........... 904.01 Reinforcement Steel ................................ ................................ ................................ ................................ ..... 905.01 Class B Bedding ................................ ................................ ................................ ................................ ....... 909.01.02 Class C Bedding ................................ ................................ ................................ ................................ ....... 909.01.03 Reinforced Concrete Sewer Pipe................................ ................................ ................................ ............... 909.02.01 PVC Sewer Pipe ................................ ................................ ................................ ................................ ....... 909.02.03 Corrugated Steel Sewer Pipe ................................ ................................ ................................ .................... 909.02.06 Ductile Iron Sewer Pipe ................................ ................................ ................................ ............................ 909.02.08 Castings ................................ ................................ ................................ ................................ ....................... 909.03 Epoxy Bedding Compound ................................ ................................ ................................ ......................... 909.03.5 Ladder Rung ................................ ................................ ................................ ................................ .............. 909.03.6 Concrete Block ................................ ................................ ................................ ................................ ............ 910.02 Concrete Brick ................................ ................................ ................................ ................................ ............. 910.03 Preformed Joint Filler ................................ ................................ ................................ ................................ ... 914.01 Asphalt Cement Waterproofing ................................ ................................ ................................ ................... 919.05 See the Special Provisions for additional materials requirements.
652.03 Construction
652.03.01 Sewer Pipe
A.Scheduling of Work. Schedule work as specified in 651.03.01.A.
B.Existing Utilities and Structures. Comply with 651.03.01.B.
C.Excavating. Excavate as specified in 202.03.03. Before excavating, sawcut full depth existing pavement and sidewalk. Excavate a trench for placing sewer pipe and appurtenances. Remove any observable rock and boulders that are within 6 inches of the pipe. Obtain RE approval before finishing excavation. If the RE determines that the bottom of the trench is unstable, undercut as directed by the RE and backfill with Class B bedding. Ensure that trenches are kept free of standing water during the in stallation of sewer pipe. Do not excavate for trenches in embankments until the embankment has been constructed to an elevation of at least 3 feet above the top of the pipe. Do not excavate trenches more than 300 feet in advance of installing the pipe unless approved by the RE. Maintain trenches according to 29 CFR 1926. Provide and maintain trench crossings where necessary. For trenches in the traveled way, shoulder and within 30 feet of the outside edge of the shoulder, backfill and restore the pavement structure and match the surrounding condition before opening to traffic. The Contractor may use temporary protection instead of backfilling trenches in the traveled way and shoulder. If using temporary protection, submit working drawings for approva l. For trenches not in the traveled way and shoulder, do not leave trenches open overnight unless protected with caution fence.
D.Handling of Pipe and Accessories. Handle pipe and accessories as specified in to 651.03.01.D. Also store o-rings and gaskets in locations where air temperatures are maintained within the manufacturer’s recommendations.
E.Installing Sanitary Sewer Gravity and Force Mains. Identify areas where pipe will have less than 3 1/2 feet of cover. Provide the RE with a report of the identified areas in order to obtain the Utility’s approval. Use a laser system to control the alignment and grade control of the pipe. Lay pipe with bell ends facing the opposite direction of flow. Lay sewer main pipe in straight lines except as approved by the RE. Adjust the depth of the pipe to pass obstructions, as approved by the RE. Install the pipe so that it is solidly supported by the underlying material over its full length except where recesses have been made for joints. Ensure that interior of the pipe is kept clean and free of intrusion by soil o r other foreign material. Protect open ends of the pipe at all times and securely seal the openings with plugs approved by the Utility whenever work is stopped. Remove the plug, inspect, and clean the interior of the pipe before resuming pipe installation. Join pipe according to the manufacturer’s recommendations. Cut pipe according to the manufacturer’s recommendations. Ensure cuts are clean and square. Install plugs, vents, tapping sleeves, valves and miscellaneous fittings. Install tapping valves and insert valves as wet connections with no interruption of flow.
F.Thrust Blocks. For sewer force mains, install thrust blocks at bends greater than 5 degrees, and at tees, plugs, and valves. Ensure thrust blocks are placed against firm, undisturbed ground. Ensure that thrust blocks do not come in contact with other utilities or structures without the approval of the RE. Place concrete as specified in 504.03.02.D.
G.Sewer Pipe Testing. After laying and jointing a complete section of pipe between manholes and before backfilling, perform a visual inspection of the pipe by lamping with a light and mirror to show if alignment contains deflection between manholes. Perform the visual inspection in the presence of the Utility inspector and to the Utility’s standards. Also test the pipe as follows:
1.Gravity Main Sewer Testing. Perform the leakage testing listed in the Special Provisions.
a.Infiltration Testing. At least 15 day before performing testing, submit a plan to the Utility for approval detailing the proposed method to construct weirs or otherwise measure infiltration, including installation of pipe plugs and methods of temporary pumping to maintain service as necessary. Submit the approved plan to the RE . Perform the infiltration testing in the presence of the sanitary sewer inspector and according to the Utility’s standards.
b.Exfiltration Testing. At least 15 day before performing testing, submit a plan to the Utility for approval detailing the proposed method to construct weirs or otherwise measure exfiltration, including installation of pipe plugs and methods of temporary pumping to maintain service as necessary. Submit the approved plan to the RE. S eal the low end of the section being tested and test the entire section of the system, including manholes, by filling the system with clean water to a minimum of 2 feet above the top of the pipe in the upstream manhole. Measure the amount of water necessa ry to maintain a constant head of pressure above the pipe for 4 hours. Perform the exfiltration testing in the presence of the sanitary sewer inspector and according to the Utility’s standards.
2.Force Main Sewer Testing. At least 15 day before performing pressure testing, submit a plan to the Utility for approval detailing the testing. Submit the approved plan to the RE. Plug the force main at the tie-in manhole. Perform hydrostatic pressure testing of the water main according to AWWA Standard C 600 in the presence of the Utility inspector using a minimum test pressure directed by the Utility. Maintain the pressure in the pipe for 120 minutes. Demonstrate, to the satisfaction of the Utility, that sanitary sewer force mains exhibit no leaks under pressure.
H.Backfilling. Symmetrically backfill on each side of the pipe in lifts not exceeding 6 inches thick, loose measurement, and compact with a flat faced mechanical tamper using the directed method as specified in 203.03.02.B.3. Where bedding is not required, backfill with suitable excavated material that is free from rock larger than 2 inches in diameter. Reu se excavated material as specified in 202.03.03.C.1. The Contractor may use CLSM as alternate backfill material when backfilling trenches. If using CLSM, install as specified in 601.03.01.F. Restore the existing pavement structure to the original condition or as shown on the Plans.
652.03.02 Ductile Iron Sewer Pipe, Bridge
Construct sanitary sewer pipe on bridges as specified in the Special Provisions.
652.03.03 Sanitary Sewer Pipe Lining
At least 15 days before beginning the work, submit to the RE and the Utility for approval a plan detailing a method to temporarily transfer the wastewater flow around the section or sections of the sewer being lined. Divert the wastewater flow from an upstream access point and pump the flow to a downstream access point by providing a pump and b ypass lines with adequate capacity to handle peak wastewater flow. Perform sanitary sewer lining by entry from existing manholes. Modify existing manholes to permit sufficient access to perform the work as approved by the RE. Before beginning lining, int ernally clean new and existing pipe lines so that they are free from internal deposits. Remove pipe obstructions and sewer service projections into the sewer in a manner approved by the Utility. If an obstruction or sewer service connection projection can not be removed internally, perform the removal using an open-cut excavation, and make any necessary pipe repairs in a manner approved by the Utility. Perform liner installation according to the manufacturer’s recommendations. Ensure that the liner neatly fits the internal circumference of the sewer to be lined. Allow for circumferential stretching during insertions according to the manufacturer’s recommendations. Perform the work to fully impregnate and cure the liner in-place, or to reform the folded liner to fully conform the liner to the pipe interior, depending upon the method used. Monitor the pressures and temperatures at both ends of the pipe where the liner is being reformed to ensure the recommended pressures and temperatures are available to fully form the liner over the entire length of the liner run. Cool the liner and relieve the pressure for the recommended time to maintain the optimum temperatures and pressures to fully form the liner. Seal the annular space between the newly installed liner and the sewer pipe where the sewer pipe enters and exits each manhole. Finish the seal on the manhole interior with a non -shrink grout. Ensure that the finished liner connection into each manhole has a watertight seal. Reinstall existing sewer service connections into the newly lined pipe.
652.03.04 Sanitary Sewer Service Connections
Comply with 651.03.01.B. Notify the Utility at least 5 days in advance of performing sewer service connections. Where new sewer mains are shown to be constructed, determine the location of existing service connections. Where service connections are not immediately being reconnected, plug the existing service to provide a watertight seal. Maintain uninterrupted wastewater flow from each existing service connection, and provide a temporary service bypass connection when necessary. Install sanitary sewer service con nections using an approved wye, wye saddle, or manhole stub. Install sanitary sewer connections so that they are watertight, according to the manufacturer’s recommendations and the Utility’s standards. Make the connection to the main using an approved flexible adaptor. If connecting to a manhole, and a stub, or knockout bulkhead is not available, connect to the manhole using a coring machine.
652.03.05 Manhole, Sanitary Sewer
Construct sanitary sewer manholes as specified in 602.03.02. Paint the outside surface of the manhole walls with 2 coats of asphalt cement waterproofing according to the manufacturer’s recommendations. Provide watertight manhole castings, unless use of existing castings is specified. The RE will not accept sanitary sewer manholes that are not watertight.
652.03.06 Reconstructed Manhole Sanitary Sewer
Reconstruct sanitary sewer manholes as specified in 602.03.02. Paint the outside surface of the manhole walls with 2 coats of asphalt cement waterproofing according to the manufacturer’s recommendations. Provide watertight manhole castings, unless using existing castings are specified. The RE will not accept sanitary sewer manholes that are not watertight.
652.03.07 Reset Manhole Sanitary Sewer
Reset sanitary sewer castings as specified in 602.03.03. Paint the outside surface of the manhole walls with 2 coats of asphalt cement waterproofing according to the manufacturer’s recommendations. Provide watertight manhole castings, unless using existing castings are specified. The RE will not accept sanitary sewer manholes that are not watertight.
652.03.08 Video Inspection of Sewer
Perform video inspection of interior pipelines as specified in 601.03.06. Provide an additional copy of the tape or digital media to the Utility.
652.03.09 Sewer As-Built Plan
Upon completion of the sewer utility work, submit to the RE and to the Utility scaled as-built plans noting the location of all Items of sewer utility construction except RESET MANHOLE, SANITARY SEWER, USING EXISTING CASTING and RESET MANHOLE, SANITARY SEWER, USING NEW C ASTING. On the plans, show stationing, distance references to the curb line, and 3 ties for each wye connection, valve, vent, and service connection within 50 feet to above-ground physical features. For gravity sewer mains, show rim, invert elevations, and pipe slopes. On t he Plans,
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 352–355 of 651. View official source ↗